linux-kernel - Re: [alsa-devel] [RFC] revoke(2) and generic handling of things like remove_proc

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Date:	Mon, 08 Apr 2013 15:16:10 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Takashi Iwai <tiwai@...e.de>, linux-fsdevel@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [alsa-devel] [RFC] revoke(2) and generic handling of things like
 remove_proc_entry()

Al Viro wrote:
> BTW, snd_card_disconnect() doesn't do anything to existing mappings; smells
> like a bug, and there we do have ones with non-trivial ->mmap().  Could
> ALSA folks comment?

I don't know of any hotplug sound driver that maps memory from a device.
All hotplug buses (PCIe, USB, FireWire) involve DMAing from/to main
memory.

When a sound device is unplugged, sample transfers just stop, but the
buffer itself stays as long as the device node is kept opened.  (In the
case of a capture device, that actually makes sense.)


Regards,
Clemens
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